[c-family] Fix issue for external subtypes with -fdump-ada-spec

[Eric Botcazou]

This works around an irregularity of the language whereby subtypes, unlike
types, are not visible through a limited_with clause.

Tested on x86-64/Linux, applied on the mainline.


2021-06-03  Eric Botcazou  <ebotcazou@adacore.com>

c-family/
	* c-ada-spec.c (pp_ada_tree_identifier): Tidy up.
	(dump_ada_node) <POINTER_TYPE>: Deal specially with external subtypes.

-- 
Eric Botcazou
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